8/13/2019 A41 Fisher Butterfly Valve http://slidepdf.com/reader/full/a41-fisher-butterfly-valve 1/16 www.Fisher.com Type A41 High-Performance Butterfly Valve The Type A41 valve (figure 1) features an eccentrically mounted disc with a soft or stainless steel seal ring. Soft seals provide excellent sealing capabilities in both flow directions. The metal seal ring provides excellent shutoff against pressure applied in the recommended flow direction for both liquid and gas applications. The NOVEX and Phoenix III metal seals are available for demanding applications requiring excellent shutoff capabilities. The double D shaft combines with a variety of power and manual actuators to form a reliable, high-performance valve suitable for many power applications requiring tight shutoff. Unless otherwise noted, all NACE references are to NACE MR0175-2002. Features Exceptional Shutoff—Patented bidirectional soft seal ring (see figure 3) with pressure-assisting action results in exceptional shutoff rates as shown in the specifications. Shaft Retention—Redundant shaft retention provides added protection. The packing follower and shaft step interact to hold the shaft securely in the valve body (see figure 2). Easy Installation—The valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline. Sour Service Capability—Materials are available for applications handling sour fluids and gases. These materials comply with the requirements of NACE MR0175-2002. W9269 Figure 1. Type A41 Valve Improved Environmental Capabilities—The optional ENVIRO-SEAL packing system is designed with improved sealing, guiding, and loading force transmission. The ENVIRO-SEAL packing system can control emissions to below the EPA (Environmental Protection Agency) limit of 100 ppm (parts per million) for valves. Low Cost Maintenance—Individual disc/shaft components can be replaced after disassembly due to sleeve and taper pin connections (see figure 2). Note Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user. Product Bulletin 21.1:A41 February 2007 A41 Valve
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The Type A41 valve (figure 1) features aneccentrically mounted disc with a soft or stainlesssteel seal ring. Soft seals provide excellent sealingcapabilities in both flow directions. The metal sealring provides excellent shutoff against pressureapplied in the recommended flow direction for bothliquid and gas applications. The NOVEX andPhoenix III metal seals are available for demandingapplications requiring excellent shutoff capabilities.The double D shaft combines with a variety of powerand manual actuators to form a reliable,high-performance valve suitable for many powerapplications requiring tight shutoff.
Unless otherwise noted, all NACE references are toNACE MR0175-2002.
Features
Exceptional Shutoff—Patented bidirectionalsoft seal ring (see figure 3) with pressure-assistingaction results in exceptional shutoff rates as shownin the specifications.
Shaft Retention—Redundant shaft retentionprovides added protection. The packing follower andshaft step interact to hold the shaft securely in thevalve body (see figure 2).
Easy Installation—The valve bodyself-centers on the line flange bolts as a fast,accurate means of centering the valve in thepipeline.
Sour Service Capability—Materials areavailable for applications handling sour fluids andgases. These materials comply with therequirements of NACE MR0175-2002.
W9269
Figure 1. Type A41 Valve
Improved Environmental Capabilities—Theoptional ENVIRO-SEAL packing system is
designed with improved sealing, guiding, andloading force transmission. The ENVIRO-SEALpacking system can control emissions to below theEPA (Environmental Protection Agency) limit of 100ppm (parts per million) for valves.
Low Cost Maintenance—Individual disc/shaftcomponents can be replaced after disassembly dueto sleeve and taper pin connections (see figure 2).
Note
Neither Emerson, Emerson ProcessManagement, nor any of their affiliatedentities assumes responsibility for the
selection, use and maintenance of anyproduct. Responsibility for theselection, use, and maintenance of anyproduct remains with the purchaserand end-user.
2, 3, 4, 6, 8, 10, and 12-inchvalve sizes available in wafer or single-flanged style (2-inch only in wafer style)
Maximum Inlet Pressures(1)
Carbon Steel and Stainless Steel ValveBodies: Consistent with Class 150 and 300pressure-temperature ratings per ASME B16.34unless limited by material temperaturecapabilities. 2-inch is also consistent with Class600.
Maximum Pressure Drops(1)
Consistent with Class 150 and 300 pressure/ temperature ratings per ASME B16.34 except forPTFE, UHMWPE, and Phoenix III seals that arederated at some higher pressure/temperaturesvalues. (See figure 4.)
Shutoff Classifications
PTFE, Reinforced PTFE, and UHMWPESeal:(4) No visible leakage for this bidirectionalseal per MSS SP-61. See figure 5. 2 Inch Metal Seal: Bidirectional shutoff.0.001% of maximum valve capacity (1/10) ofClass IV per ANSI/FCI 70-2 and IEC 60534-4.Pressure Drop is 740 psig forward and 100 psigreverse. NOVEX Seal: For 3 through 12- inch sizes.Unidirectional shutoff is MSS SP-61 in thepreferred flow direction. See figure 5. Phoenix III Seal: For 3 through 12- inch sizes.No visible leakage for this bidirectional seal perMSS SP-61. See figure 5. For optional Phoenix IIIFire-Tested seal(3), consult your EmersonProcess Management sales office.
Material Temperature Capabilities(1)
PTFE and Reinforced PTFE Seals: –46 to232C (–50 to 450F)UHMWPE Seal:(4) –18 to 93C (0 to 200F)2 Inch Metal Seal: -46 to 538C (-50 to 1000F)
NOVEX Seal: –46 to 538C (–50 to 1000F)Phoenix III: –46 to 232C (–50 to 450F)See table 3 for component temperature ranges
Construction Materials
Refer to table 3 for standard and optional materialselections
Flow Characteristic
Approximately linear
Flow Direction
Refer to figure 5.
Flow Coefficients
See table 2, the section titled Coefficients in thisbulletin, and also Catalog 12.
Noise Levels
See Catalog 12 for sound pressure levelprediction
Disc Rotation
Clockwise to close (when viewing from the driveshaft end) through 90 degrees of disc rotation
Available Actuators
Pneumatic piston, manual handwheel or handlever (handlevers are available for Class150 up to an 8-inch valve, and for Class 300 up toa 6-inch valve)
Actuator/Valve Action
With a pneumatic actuator, the valve action isreversible. Refer to the information provided in theInstallation section and figure 5.
Valve Classification
Face-to-face dimensions of 3- through 12-inchsizes in Class 150 or 300, and meets API 609 orMSS SP-68 standards for face-to-facedimensions of wafer style and single-flangevalves (see figure 7)
Mating Flange CapabilitiesAll sizes compatible with appropriate Class 150 or300, and 2- inch also compatible with Class 600,flanges (schedule 80 or lighter, see figure 7,dimension M)
Shaft Diameters
See figure 7
Approximate WeightsSee table 1
ENVIRO-SEAL Packing
This optional PTFE or graphite packing systemprovides improved sealing, guiding, andtransmission of loading force to control liquid andgas emissions (see figure 6). See Bulletin59.3:041 ENVIRO-SEAL Packing Systems forRotary Valves f or more information.
1. The pressure/temperature limits in this bulletin and any applicable standard or code limitation for valve should not be exceeded.2. Optional Class V shutoff is available by contacting your Emerson Process Management sales office.3. For component selection and applicable fire-tested standards and codes, consult your Emerson Process Management sales office (see table 2).4. UHMWPE stands for ultra high molecular weight polyethylene.
Table 1. Valve Weights
WAFER STYLE SINGLE-FLANGE
VALVE SIZE, INCHES Class 150 Class 300 Class 150 Class 300
Kilograms
2 4 4 - - - - - -
3 5 6 6 11
4 9 10 11 18
6 13 15 16 27
8 21 24 27 42
10 34 44 40 78
12 49 64 62 131
Pounds
2(1) 9.5 9.5 - - - - - -
3 10 13 14 25
4 19 23 24 39
6 29 33 35 59
8 47 53 59 93
10 75 96 88 172
12 107 141 137 288
1. Weight of the Class 600 2 Inch valve is the same as the Class 150 and Class 300 values.
InstallationIt is recommended that the valve drive shaft bemounted in a horizontal position (the one shown infigure 1 is in a vertical position). Operating
conditions may require specific valve/actuator failaction, styles, positions and flow direction. Valveswith NOVEX seal rings require mounting in thereverse flow direction. Refer to figure 5. Largevalve/actuator assemblies may require additionalsupport because of the combined weight.
Fail Action: For actuators with spring returns, springfail action is available for: fail-to-open or fail-to-closevalve action. The valve action is field reversible.
For assistance in selecting the valve/actuatormounting suited to your application, consult yourEmerson Process Management sales office.Dimensions for wafer-style and single-flanged valvesare shown in figure 7.
1. This nominal valve shaft diameter is the shaft diameter through the packing box. Use this diameter when selecting Fisher actuators.2. Disc chordal swing diameter at valve face. Please verify clearance with piping.
1. This nominal valve shaft diameter is the shaft diameter through the packing box. Use this diameter when selecting Fisher actuators.2. Disc chordal swing diameter at valve face. Please verify clearance with piping.
Neither Emerson, Emerson ProcessManagement, nor any of their affiliatedentities assumes responsibility for the
selection, use and maintenance of anyproduct. Responsibility for theselection, use, and maintenance of anyproduct remains with the purchaserand end-user.
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